First, make sure that your system is up to date, and then install the rdo-release.rpm from the website to get the latest version. Finally, install the OpenStack-packstack package that will automate the OpenStack installation, as shown in the following snippet:
$ sudo yum install -y https://www.rdoproject.org/repos/rdo-release.rpm $ sudo yum update -y $ sudo yum install -y OpenStack-packstack